/Engine/Source/Editor/UnrealEd/Public/WorkflowOrientedApp/WorkflowTabFactory.h
Called when a tab is being closed virtual void OnTabClosed(TSharedRefTab, TSharedPtrPayload) const {}
virtual bool IsPayloadSupported ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [FTabPayload](API\Editor\UnrealEd\WorkflowOrientedApp\FTabPayload) > Payload ) const